BIOL 2013Lecture 6Outline of Last LectureI. groups of microorganismsII. prokaryotes and eukaryotesIII. characteristics of microbial groups Outline of Current LectureI. parts of a prokaryotic cellII. Gram stainingIII. diffusionCurrent LectureI. parts of a prokaryotic cellA. pilusB. fimbriaC. capsuleD. plasmid1. it is outside the clump of DNA of the bacteria2. helpful in transferring bacterial resistance from one generation to the otherE. flagellum1. some have it and some don’t2. typesa) peritrichus: all over the cellb) monotrichous: just one on the cellc) lophotrichous: many in one place on the celld) amphitrichous: one on each end of the cellF. cytoplasmG. nucleoid1. bacteria cells divide by binary fissionH. ribosomes1. main function is protein synthesis2. penicillin works by destroying the cell walla) mycoplasma have no cell walls so we can’t use penicillin against this microorganismI. cell wall1. keep, preserve, and protect bacterial cellsJ. plasma mebrane1. polar head (hydrophilic)2. nonpolar tails (hydrophobic)3. selectively permeable4. It can be referred to as a Fluid Mosaic ModelII. Gram Staining (Christian Gram 1884)A. Gram Positive1. more peptidoglycan2. it has teichoic acidsB. Gram negative1. a little peptidoglycan2. has lipopolysaccharide (LPS)III. Diffusion A. simple diffusion: movement of solute from an area of high concentration to an area of low
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